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Experimental investigation of the effect of engine settings on the wall heat flux during HCCI combustion

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  • Broekaert, Stijn
  • De Cuyper, Thomas
  • De Paepe, Michel
  • Verhelst, Sebastian

Abstract

Homogeneous charge compression ignition (HCCI) engines are a promising alternative to traditional spark- and compression-ignition engines, due to their potential to achieve a high thermal efficiency and near-zero emissions of NOx and soot. In this work, the heat transfer from the bulk gas to the cylinder wall is measured during motored and HCCI operation in a single cylinder (CFR) engine fueled with n-heptane. Heat flux measurements in the cylinder wall and head show small spatial variation of the heat flux in the combustion chamber. Design of Experiments methods are applied to study the effect of the engine settings on the heat transfer. It is found that the inlet air temperature does not affect the heat flux under motored operation. Under fired operation, all engine settings affect the heat transfer, but none of their interactions are significant. The compression ratio and inlet air temperature have a quadratic effect on the peak heat flux and peak convection coefficient, whereas the mass fuel rate has a linear effect. For the total heat released, the compression ratio and inlet air temperature have a linear effect and the mass fuel rate has a quadratic effect on it. All engine settings affect the instantaneous heat flux.

Suggested Citation

  • Broekaert, Stijn & De Cuyper, Thomas & De Paepe, Michel & Verhelst, Sebastian, 2016. "Experimental investigation of the effect of engine settings on the wall heat flux during HCCI combustion," Energy, Elsevier, vol. 116(P1), pages 1077-1086.
    • Handle: RePEc:eee:energy:v:116:y:2016:i:p1:p:1077-1086
    DOI: 10.1016/j.energy.2016.10.042
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    1. De Cuyper, Thomas & Demuynck, Joachim & Broekaert, Stijn & De Paepe, Michel & Verhelst, Sebastian, 2016. "Heat transfer in premixed spark ignition engines part II: Systematic analysis of the heat transfer phenomena," Energy, Elsevier, vol. 116(P1), pages 851-860.
    2. Broekaert, Stijn & Demuynck, Joachim & De Cuyper, Thomas & De Paepe, Michel & Verhelst, Sebastian, 2016. "Heat transfer in premixed spark ignition engines part I: Identification of the factors influencing heat transfer," Energy, Elsevier, vol. 116(P1), pages 380-391.
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    Cited by:

    1. Han, Dong & Zhai, Jiaqi & Duan, Yaozong & Wang, Chunhai & Huang, Zhen, 2018. "Nozzle effects on the injection characteristics of diesel and gasoline blends on a common rail system," Energy, Elsevier, vol. 153(C), pages 223-230.
    2. Decan, Gilles & Broekaert, Stijn & Lucchini, Tommaso & D’Errico, Gianluca & Vierendeels, Jan & Verhelst, Sebastian, 2018. "Evaluation of wall heat flux calculation methods for CFD simulations of an internal combustion engine under both motored and HCCI operation," Applied Energy, Elsevier, vol. 232(C), pages 451-461.
    3. Broekaert, Stijn & De Cuyper, Thomas & De Paepe, Michel & Verhelst, Sebastian, 2017. "Evaluation of empirical heat transfer models for HCCI combustion in a CFR engine," Applied Energy, Elsevier, vol. 205(C), pages 1141-1150.

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